Don't usually talk about this stuff, but when I think about it, if you go back far enough and don't get bogged down in the details, surely there are only 3 main options concerning the beginning of the universe/life/etc.
(Option 1) - A God has always existed, and decided to create the universe, or at least created a system of nature through which the universe could be created.
(Option 2) - That the laws of nature/particles etc have always existed and led to the creation of the universe.
(Option 3) - Something else happened that the human mind can't comprehend.
And then I think, surely option 1 is the most likely?
Thoughts...